A-level polyester fiber fire-retardant sound absorption board production equipment and process

Abstract

The application discloses a kind of A-grade polyester fiber flame-retardant sound-absorbing board production equipment, including sequentially connected opening mechanism, carding mechanism, net mechanism and needling mechanism, heating mechanism, calendering mechanism, cold air mechanism, spraying mechanism, drying mechanism, cooling roll pressure mechanism, laser cutting mechanism, and controller, the A-grade flame retardant agent for expansion type carbon silicon flame retardant agent is used, and the production process of the A-grade polyester fiber flame-retardant sound-absorbing board produced using the above production equipment, the beneficial effects of the application are: the production equipment and process of the application meet the production requirements of A-grade flame retardant agent, the product prepared by the application is environmentally friendly, formaldehyde-free, odorless, and uses one-time forming mode, there is no energy loss in the middle link, the board processing is continuous, the production efficiency is greatly improved, the production cost is reduced, and the forming quality of the board and the flame-retardant, sound-absorbing performance are also ensured.

Description

Technical Field

[0001] This invention relates to the field of polyester fiberboard production equipment and process technology, and in particular to a production equipment and process for a Class A polyester fiber flame-retardant sound-absorbing board. Background Technology

[0002] Polyester fiberboard, also known as polyester fiber sound-absorbing board, is a noise-reducing material made from polyester fibers through hot pressing. It combines sound absorption with sound-absorbing properties, creating a quiet working and living space. Due to its decorative, heat-insulating, flame-retardant, environmentally friendly, lightweight, easy-to-process, stable, impact-resistant, and easy-to-maintain characteristics, it has become a preferred decorative sound-absorbing material for interior decoration and is widely used in homes, shopping malls, hotels, KTVs, theaters, dance halls, auditoriums, multi-functional halls, stadiums, and other public gathering places. The production process of polyester fiber sound-absorbing boards generally involves: opening, blending, carding, web laying, needle punching, oven hot pressing, air cooling, and edge trimming. Tests conducted by the National Fire Protection Testing Center on the fire resistance parameters of polyester fiberboard show that it has good fire resistance. To further enhance its fire-retardant properties, flame retardants are usually sprayed onto the polyester fiberboard. Existing flame retardants typically achieve a Class B fire resistance rating. To further improve fire resistance, silicon-based... When modified, its flame retardant effect can reach Grade A. The flame retardant mechanism is to disperse nano-silica in water and prepare silica gel material through large circulation. This material is then applied to the outer surface of the fiber filaments forming the fiberboard. After curing, silica crystals are precipitated and fill the fiber pores. However, during large circulation, as the amount of silica solution gradually decreases, the silica gel material applied to the outer surface of the fiber filaments becomes uneven. Furthermore, since the silica crystals are precipitated after curing, the silica filling the fiber pores becomes unstable as the solution evaporates, resulting in a "powdering" phenomenon that affects the flame retardant effect and poses a safety hazard. Since the flame retardant mechanism commonly used in silicon-based modification is the precipitation of silica crystals after curing and filling the fiber pores, when applied to polyester fiber sound-absorbing panels, the nano-sized silica will fill the pores in the polyester fiber sound-absorbing panels used for sound absorption, thereby reducing the sound absorption effect of the polyester fiber sound-absorbing panels.

[0003] As an inorganic material board, glass wool board can achieve Class A fire resistance. However, as is well known, glass wool board can harm the skin and respiratory system of the human body.

[0004] CN201710182859.2 discloses a fully automated production line for one-time molding of polyester fiber flame-retardant sound-absorbing panels. The production line includes a loosening mechanism, a carding mechanism, a web-laying mechanism, and a needle-punching mechanism connected in sequence. The loosening mechanism has a short fiber inlet, and the needle-punching mechanism has a panel outlet. The panel outlet is connected to a spraying mechanism for applying flame retardant to the panel. The output end of the spraying mechanism is connected in sequence to a pre-drying mechanism for curing the flame retardant onto the fibers of the panel, a heating mechanism for forming the panel, a calendering mechanism, and a cold air mechanism. The panel output by the cold air mechanism enters a laser cutting mechanism. This one-time molding method eliminates energy loss in intermediate steps, allows for continuous panel processing, significantly improves production efficiency, reduces production costs, and ensures the panel's molding quality and flame-retardant and sound-absorbing properties. However, in this patented production line, the spraying mechanism is located after the needle-punching mechanism, allowing the flame retardant to adhere to the inner layer and between the polyester fibers before drying to melt and solidify the fibers. The resulting panel has a Class B fire-retardant rating, but cannot achieve Class A fire resistance.

[0005] Therefore, there is a need for a new, stable flame retardant, as well as the equipment and process for using the flame retardant, so that the flame retardant can be stably attached to polyester fibers, have stable physical properties, and at the same time ensure the sound absorption effect of the polyester fiber board. Summary of the Invention

[0006] In view of the above-mentioned defects in the existing technology, the technical problem to be solved by the present invention is to provide a production equipment and process adapted to Class A flame retardants, so that the Class A flame retardants can be stably attached to polyester fibers without producing "powdering" phenomenon, thereby improving the fire resistance of polyester fiber flame retardant sound-absorbing panels and ensuring the sound absorption effect of polyester fiber panels.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a production equipment for Class A polyester fiber flame-retardant sound-absorbing panels, comprising an opening mechanism, a carding mechanism, a web-laying mechanism, and a needle-punching mechanism connected in sequence. The opening mechanism is provided with a short fiber inlet, and the needle-punching mechanism is provided with a panel outlet. The panel outlet is connected to a heating mechanism, a calendering mechanism, and a cold air mechanism for forming the panel. After being cooled by the cold air mechanism, the panel enters a spraying mechanism for applying Class A flame retardant to the panel. At the output end of the spraying mechanism, a drying mechanism for curing the Class A flame retardant onto the fibers of the panel and a cooling roller pressing mechanism for cooling and extruding the panel to the required thickness are connected in sequence. The panel output from the cooling roller pressing mechanism enters a laser cutting mechanism and a controller.

[0008] Furthermore, the Class A flame retardant is an intumescent carbon-silicon flame retardant, and the raw materials are: sodium silicate: 50%-60%, alkaline agent: 5%-6%, calcium chloride: 0.1%-1%, sodium oxide: 0.2%-0.5%, neutral water: balance, and the pH value of the solution is between 12 and 13.

[0009] Furthermore, the spraying mechanism includes an immersion tank for impregnating the sheet material with Class A flame retardant. One side of the immersion tank is designated as the inlet, and the other side as the outlet. Multiple spray heads are installed on the top of the immersion tank to evenly spray Class A flame retardant onto the surface of the sheet material when it enters the immersion tank via the inlet. Each spray head is connected to a delivery pipe for conveying Class A flame retardant. A spray tank for supplying Class A flame retardant to the spray heads and a pressure pump for driving the high-pressure spraying of the Class A flame retardant are connected to the delivery pipe. The mechanism also includes an impregnation control mechanism for controlling the amount of the sheet material entering the immersion tank and being immersed in the Class A flame retardant. The impregnation control mechanism includes a lifting bracket for immersing the sheet material in the Class A flame retardant. A servo motor is installed on the immersion tank to drive the lifting bracket to move up and down. A position sensor is installed inside the immersion tank to detect the distance between the sheet material and the surface of the Class A flame retardant. After detecting the position signal of the sheet material, the position sensor sends it to the servo motor, which then drives the lifting bracket to rise or fall.

[0010] Furthermore, a roller assembly for conveying and supporting the plate is sequentially arranged from the inlet end to the outlet end of the immersion tank. The roller assembly includes an input roller at the inlet end, a first support roller on the immersion tank, a first forming roller and a second forming roller inside the immersion tank, a second support roller on the outlet end of the immersion tank, and an outlet roller. The input roller, the first support roller, the first forming roller, the second forming roller, the second support roller, and the outlet roller are all fixedly connected to the lifting bracket. The inlet end and the outlet end of the immersion tank are respectively provided with a first support rod and a second support rod that can move up and down along the tank wall. The first support roller and the second support roller are respectively connected to the first support rod and the second support rod. The first support rod and the second support rod are both connected to a servo motor through a lead screw.

[0011] Furthermore, the cooling roller pressing mechanism includes multiple pairs of upper and lower cooling rollers that cooperate to cool the extruded sheet metal, multiple motors that drive the upper and lower cooling rollers to rotate, and a cooling mechanism that connects the upper and lower cooling rollers in series. The cooling mechanism includes an outdoor cooling unit connected to a circulating water tank via cooling pipes. The upper cooling rollers are connected to the circulating water tank via inlet pipes, and a water pump is connected to the inlet pipes. It also includes a connecting pipe that connects the upper and lower cooling rollers, and an outlet pipe that connects the lower cooling rollers to the circulating water tank. The upper cooling roller includes a roller body, a first bearing connected to one side of the roller body, a first sealing layer for preventing cooling water from flowing out inside the roller body and outside the first bearing, a hollow first shaft head connected to the inner ring of the first bearing, a drive gear fixedly connected to the outer ring of the first bearing and the side of the roller body, the drive gear being connected to a motor via a chain, a second bearing connected to the other side of the roller body, a second sealing layer for preventing cooling water from flowing out inside the roller body and outside the second bearing, and a hollow second shaft head connected to the inner ring of the second bearing.

[0012] Furthermore, adjustment frames are provided on both sides of the upper and lower cooling rollers, and slide rails are provided on the adjustment frames. The lower cooling roller passes through the slide rails and is fixedly connected to the adjustment frame through a fixing plate. The upper cooling roller passes through the slide rails and is slidably connected to the adjustment frame through a sliding plate. A screw that passes through the adjustment frame and adjusts the distance between the upper and lower cooling rollers is provided on the sliding plate.

[0013] Furthermore, the production process for producing Class A polyester fiber flame-retardant sound-absorbing panels using the aforementioned production equipment includes the following steps:

[0014] (1) Polyester staple fibers are sequentially passed through an opening mechanism, a carding mechanism, a web laying mechanism and a needle punching mechanism to complete opening and mixing, carding, web laying and needle punching, to obtain nonwoven fabric;

[0015] (2) The nonwoven fabric enters the heating mechanism and calendering mechanism to obtain the formed board, and then passes through the cold air mechanism for cooling treatment, and the board returns to room temperature;

[0016] (3) The boards enter the spraying mechanism for spraying operations;

[0017] (4) Enter the drying mechanism to cure the Class A flame retardant onto the fibers of the board body and form a sodium silicate film on the fiber surface;

[0018] (5) The plate is then cooled to room temperature by a cooling roller pressing mechanism and rolled to the required thickness.

[0019] (6) Enter the laser cutting mechanism for cutting to obtain the required size and complete the production.

[0020] Furthermore, in step (3), the spraying operation brings the liquid coverage of the board to 26%-30%.

[0021] The beneficial effects of the production equipment and process for Class A polyester fiber flame-retardant sound-absorbing panels of this invention are as follows: The production equipment and process of this invention are adapted to the production requirements of Class A flame retardants. The produced polyester fiber panels have combustion performance that meets the Class A requirements of GB8624. The spraying mechanism utilizes a simultaneous spraying and impregnation method to perform upper spraying and lower impregnation of the Class A flame retardant, which can reasonably control the liquid content of the sound-absorbing panels, preparing them for subsequent drying processes. Furthermore, the Class A flame retardant is evenly distributed between the fiber films of the polyester fiber panels, greatly improving the overall flame-retardant effect. Simultaneously, after drying, the Class A flame retardant is cured on the fibers of the panel body, forming a sodium silicate film on the fiber surface. Numerous gaps exist between the sodium silicate films, ensuring sound absorption. There is no formaldehyde release during the production process, avoiding the harm to human health caused by glass wool panels, making it an environmentally friendly process. Flame-retardant fiberboard can be widely used in interior decoration, flame-retardant furniture production, flame-retardant flooring production, and ship and vehicle interior decoration, offering significant economic and social benefits. During production, the raw materials themselves melt and bond to form a physical adhesive structure with low impurity content. A cooling air system cools the polyester fiber flame-retardant sound-absorbing board to room temperature, preparing it for spraying and impregnation with Class A flame retardants. A drying and cooling roller pressing system rapidly shapes the boards, saving production time. The cooling roller pressing system also allows for adjustment of the board thickness according to production needs. The products prepared using this invention are environmentally friendly, formaldehyde-free, and odorless. Furthermore, the one-time molding process eliminates energy loss in intermediate steps, enabling continuous board processing. This significantly improves production efficiency while reducing production costs, and ensures the quality of the boards and their flame-retardant and sound-absorbing properties. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is an enlarged view of the spray mechanism of the present invention;

[0024] Figure 3 This is a schematic diagram of the cooling roller pressing mechanism of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the cooling roller of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the adjustment frame of the present invention. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-5As shown, a production equipment for Class A polyester fiber flame-retardant sound-absorbing panels includes an opening mechanism 22, a carding mechanism 23, a web-laying mechanism 24, and a needle-punching mechanism 25 connected in sequence. The opening mechanism 22 is provided with a short fiber inlet 26, and the needle-punching mechanism 25 is provided with a board outlet 27. The board outlet 27 is connected to a heating mechanism 29, a calendering mechanism 31, and a cold air mechanism 32 for forming the board 1. After being cooled by the cold air mechanism 32, the board 1 enters a spraying mechanism 28 for applying Class A flame retardant 2 to the board 1. Compared with the prior art, the reason for placing the spraying mechanism 28 after the cold air mechanism 32, that is, processing the polyester fiber board first and then spraying and impregnating the polyester fiber board, is that the Class A flame retardant 2 used in this application is a gel-like substance with sodium silicate as the main component. The flame retardant is alkaline, while traditional flame retardants are acidic. If spraying and impregnation are performed immediately after needle punching, the alkaline Class A flame retardant 2 adheres to the fibers, encapsulating them and hardening them. This effectively provides fire protection, preventing subsequent drying and heating from melting the fibers. The Class A flame retardant 2 must be melted before the fibers can be melted, making it impossible to produce Class A polyester fiber flame-retardant sound-absorbing panels and form panel 1. Therefore, spraying and impregnation must be performed after the polyester fiber panel is formed. At the output end 5 of the spraying mechanism 28, a drying mechanism 30 is sequentially connected to solidify the Class A flame retardant 2 onto the fibers of panel 1, and a cooling roller pressing mechanism 34 is connected to cool and extrude panel 1 to the required thickness. The output sheet 1 enters the laser cutting mechanism 33 and the controller. The spraying mechanism 28 includes an immersion tank for impregnating the sheet 1 with Class A flame retardant 2. One side of the immersion tank 3 is set as the inlet end 4, and the other side is set as the outlet end 5. Multiple spray heads 6 are set on the top of the immersion tank 3 for uniformly spraying Class A flame retardant 2 onto the surface of the sheet 1 when it enters the immersion tank 3 through the inlet end 4. Each spray head 6 is connected to a delivery pipe 7 for conveying Class A flame retardant 2. A spray tank 20 for supplying Class A flame retardant 2 to the spray head 6 and a pressure pump 21 for driving the Class A flame retardant 2 to be sprayed out at high pressure are connected to the delivery pipe 7. The mechanism also includes an impregnation amount control mechanism for controlling the amount of the sheet 1 entering the immersion tank 3 and being immersed in Class A flame retardant 2. The impregnation control mechanism includes a lifting bracket 8 that drives the sheet 1 to be immersed in the Class A flame retardant 2. A servo motor 9 is installed on the impregnation tank 3 to drive the lifting bracket 8 to rise and fall. A position sensor 10 is installed inside the impregnation tank 3 to detect the distance between the sheet 1 and the surface of the Class A flame retardant 2. After the position sensor 10 detects the position signal of the sheet 1, it sends it to the servo motor 9. After receiving the position signal, the servo motor 9 drives the lifting bracket 8 to rise or fall. From the inlet end 4 to the outlet end 5 of the impregnation tank 3, roller assemblies for conveying and supporting the sheet 1 are arranged sequentially. The roller assembly includes an input roller 11 installed at the inlet end 4, a first support roller 12 installed on the impregnation tank 3, a first forming roller 13 installed inside the impregnation tank 3, and a second forming roller 14.The second support roller 15 and the output roller 16 are installed on the immersion tank 3 at the output end 5. The input roller 11, the first support roller 12, the first forming roller 13, the second forming roller 14, the second support roller 15, and the output roller 16 are all fixedly connected to the lifting bracket 8. The inlet end 4 and the output end 5 of the immersion tank 3 are respectively provided with a first support rod 17 and a second support rod 18 that can move up and down along the tank wall of the immersion tank 3. The first support roller 12 and the second support roller 15 are respectively connected to the first support rod 17 and the second support rod 18. The first support rod 17 and the second support rod 18 are both connected to the servo motor 9 through the lead screw 19. The cooling roller pressing mechanism 34 includes multiple The upper cooling roller 35 and lower cooling roller 36, which work together to cool the extruded sheet 1, have identical structures. Multiple motors drive the upper cooling roller 35 and lower cooling roller 36 to rotate, and a cooling mechanism connects the upper cooling roller 35 and lower cooling roller 36 in series. The cooling mechanism includes an outdoor cooling unit 37, which is connected to a circulating water tank 39 via a cooling pipe 38. The upper cooling roller 35 is connected to the circulating water tank 39 via an inlet pipe 40, and a water pump 41 is connected to the inlet pipe 40. A connecting pipe 42 connects the upper cooling roller 35 and lower cooling roller 36, and an outlet pipe 43 connects the lower cooling roller 36 to the circulating water tank 39. The upper cooling roller 35 includes a roller body 44. A first bearing 45 is connected to one side of the roller body 44. A first sealing layer 46 for preventing cooling water from flowing out is provided inside the roller body 44 and outside the first bearing 45. A hollow first shaft head 47 is connected to the inner ring of the first bearing 45. A drive gear 48 is fixedly connected to the outer ring of the first bearing 45 and the side of the roller body 44. The drive gear 48 is connected to a motor via a chain. A second bearing 49 is connected to the other side of the roller body 44. A second sealing layer 50 for preventing cooling water from flowing out is provided inside the roller body 44 and outside the second bearing 49. A hollow second shaft head 51 is connected to the inner ring of the second bearing 49. Adjusting frames 52 are provided on both sides of the lower cooling roller 35 and the upper cooling roller 36. Slide rails 53 are provided on the adjusting frames 52. The lower cooling roller 36 passes through the slide rails and is fixedly connected to the adjusting frames 52 via a fixing plate 54. The upper cooling roller 35 passes through the slide rails 53 and is slidably connected to the adjusting frames 52 via a sliding plate 55. A screw 56 passing through the adjusting frames 52 is provided on the sliding plate 55 to adjust the distance between the upper cooling roller 35 and the lower cooling roller 36. The Class A flame retardant 2 is an intumescent carbon-silicon flame retardant. The raw materials are: sodium silicate: 50%-60%, alkaline agent: 5%-6%, calcium chloride: 0.1%-1%, sodium oxide: 0.2%-0.5%, neutral water: balance. The pH value of the solution is between 12 and 13.

[0029] The production process of Grade A polyester fiber flame-retardant sound-absorbing panels includes the following steps:

[0030] (1) Polyester staple fibers are passed sequentially through opening mechanism 22, carding mechanism 23, web laying mechanism 24 and needle punching mechanism 25 to complete opening and mixing, carding, web laying and needle punching, to obtain nonwoven fabric;

[0031] (2) The nonwoven fabric enters the heating mechanism 29 and the calendering mechanism 31 to obtain the formed board 1, and then passes through the cold air mechanism 32 for cold air cooling treatment, and the board 1 returns to room temperature.

[0032] (3) The board 1 enters the spraying mechanism 28 for spraying operation to ensure that the liquid coverage of the board 1 reaches 26%-30%. When the polyester fiber board is sprayed and impregnated with Class A flame retardant 2, the sodium silicate is alkaline and will increase the adhesion, adhere to the fiber film surface, and coat the outer surface of the polyester fiber board.

[0033] (4) Enter the drying unit 30, the temperature is usually 100-120℃, the moisture is evaporated, the melting temperature of Class A flame retardant 2 needs to reach 300-400℃, after the moisture evaporates, Class A flame retardant is solidified on the fiber of the board body, forming a sodium silicate film on the fiber surface, and there are a lot of gaps in the sodium silicate film, which will not affect the sound absorption performance.

[0034] (5) The plate is then cooled to room temperature by the cooling roller pressing mechanism 34 and rolled to the required thickness;

[0035] (6) Enter the laser cutting mechanism 33 for cutting to obtain the required size and complete the production.

[0036] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A production device for A-grade polyester fiber fire-retardant sound-absorbing board, comprising an opening mechanism, a carding mechanism, a laying mechanism and a needling mechanism connected in sequence, the opening mechanism is provided with a staple fiber feeding port, and the needling mechanism is provided with a board discharging port, characterized in that: The sheet material outlet is connected to a heating mechanism, a calendering mechanism, and a cooling mechanism for forming the sheet material. After being cooled by the cooling mechanism, the sheet material enters a spraying mechanism for applying Class A flame retardant to the sheet material. At the output end of the spraying mechanism, a drying mechanism for curing the Class A flame retardant onto the fibers of the sheet material is connected in sequence, as well as a cooling roller pressing mechanism for cooling the sheet material and extruding it to the required thickness. The sheet material output from the cooling roller pressing mechanism enters a laser cutting mechanism and a controller. The cooling roller pressing mechanism includes multiple pairs of upper and lower cooling rollers that cooperate to cool the extruded sheet metal, multiple motors that drive the upper and lower cooling rollers to rotate, and a cooling mechanism that connects the upper and lower cooling rollers in series. The cooling mechanism includes an outdoor cooling unit connected to a circulating water tank via a cooling pipe. The upper cooling roller is connected to the circulating water tank via an inlet pipe, and a water pump is connected to the inlet pipe. It also includes a connecting pipe that connects the upper and lower cooling rollers and an outlet pipe that connects the lower cooling roller to the circulating water tank. The upper cooling roller includes a roller body with a first bearing connected to one side. A first sealing layer for preventing cooling water from flowing out is provided inside the roller body and outside the first bearing. A hollow first shaft head is connected to the inner ring of the first bearing. A drive gear is fixedly connected to the outer ring of the first bearing and the side of the roller body. The drive gear is connected to the motor via a chain. A second bearing is connected to the other side of the roller body with a second sealing layer for preventing cooling water from flowing out. A hollow second shaft head is connected to the inner ring of the second bearing. Adjustment frames are provided on both sides of the upper and lower cooling rollers. Slide rails are provided on the adjustment frames. The lower cooling roller passes through the slide rails and is fixedly connected to the adjustment frame through a fixing plate. The upper cooling roller passes through the slide rails and is slidably connected to the adjustment frame through a sliding plate. A screw that passes through the adjustment frame and adjusts the distance between the upper and lower cooling rollers is provided on the sliding plate. The Class A flame retardant is an intumescent carbon-silicon Class A flame retardant, with the following raw materials: sodium silicate: 50%-60%, alkaline agent: 5%-6%, calcium chloride: 0.1%-1%, sodium oxide: 0.2%-0.5%, neutral water: balance, and the pH value of the solution is between 12 and 13.

2. The production device of the A-level polyester fiber flame-retardant sound absorption panel according to claim 1, characterized in that: The spraying mechanism comprises a dipping tank for dipping the plate into A-grade flame retardant, one side of the dipping tank is provided as an entry end, the other side is provided as an output end, a plurality of spray heads for uniformly spraying A-grade flame retardant on the surface of the plate when the plate enters the dipping tank through the entry end are arranged on the top of the dipping tank, each spray head is connected with a conveying pipe for conveying A-grade flame retardant, a spray tank for supplying A-grade flame retardant to the spray head and a pressure pump for driving high-pressure spraying of A-grade flame retardant are connected to the conveying pipe, and a dipping amount control mechanism for controlling the plate to enter the dipping tank and be dipped into A-grade flame retardant is further included, the dipping amount control mechanism comprises a lifting support for dipping the plate into A-grade flame retardant, a servo motor for driving the lifting support to lift and drop is arranged on the dipping tank, and a position sensor for detecting the size of the plate from the liquid surface of A-grade flame retardant is arranged in the dipping tank, the position signal of the plate detected by the position sensor is sent to the servo motor, and the servo motor drives the lifting support to lift or drop after receiving the position signal.

3. The A-level polyester fiber flame-retardant acoustic panel production apparatus according to claim 2, characterized by: Roller assemblies for conveying and supporting the plate are sequentially arranged from the entry end to the output end of the dipping tank, the roller assemblies comprise an input roller arranged at the entry end, a first supporting roller arranged on the dipping tank, a first forming roller and a second forming roller arranged in the dipping tank, a second supporting roller arranged on the dipping tank at the output end, and an output roller, the input roller, the first supporting roller, the first forming roller, the second forming roller, the second supporting roller and the output roller are fixedly connected with the lifting support, the entry end and the output end of the dipping tank are respectively provided with a first supporting rod and a second supporting rod which can move up and down along the tank wall of the dipping tank, the first supporting roller and the second supporting roller are connected with the first supporting rod and the second supporting rod respectively, and the first supporting rod and the second supporting rod are connected with the servo motor through a lead screw.

4. A production process for producing the A-level polyester fiber flame-retardant sound absorption board by using the production equipment for the A-level polyester fiber flame-retardant sound absorption board according to any one of claims 1-3, characterized in that, The method comprises the following steps: (1) polyester staple fibers are sequentially passed through an opening mechanism, a carding mechanism, a laying mechanism and a needling mechanism to complete opening mixing, carding, laying and needling, and obtain a non-woven fabric; (2) the non-woven fabric enters a heating mechanism and a calendering mechanism to obtain a formed plate, and then the plate is cooled by a cold air mechanism to room temperature; (3) the plate enters a spraying mechanism for spraying operation; (4) the plate enters a drying mechanism to solidify A-grade flame retardant on the fibers of the plate body and form a sodium silicate film on the surface of the fibers; (5) the plate is cooled to room temperature by a cooling roller pressing mechanism, and the plate is rolled to a required thickness; (6) the plate enters a laser cutting mechanism for cutting to obtain a required size and complete production.

5. The process for producing a Class A polyester fiber flame- retardant acoustic panel according to claim 4, characterized in that: In step (3), the spraying operation makes the liquid carrying rate of the plate reach 26%-30%.

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